US3793039A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Foamed glass body
Assignee: Corning Glass Works
•
Filing: 1972-08-02
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Granted: 1974-02-19
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Expires: 1992-08-02
Abstract
Abstract This invention relates to the production of low expansion, nondevitrifying alkali metal aluminoborosilicate glass foam bodies at temperatures not exceeding about 1,000*C. (1,832*F.).
Inventors
- 👤 D Rostoker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 07:20
CPC Classifications
C; C03; C03C; C03C11/00; C03C11/007; C03B; C03B19/00; C03B19/08; C03C3/00; C03C3/04; C03C3/076; C03C3/089; C03C3/091
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
24 words
A batch according to claim 1 wherein said clay contains, as a principal component, at least one mineral from the illite and/or smectite groups.
Claim 2
Dependent Claim
36 words
said cellulating agent comprises about 0.1-2 percent carbon and is selected from the group consisting of carbon, an organic compound which thermally decomposes to yield carbon at a temperature below the cellulating temperature, and mixtures thereof;
Claim 3
Dependent Claim
20 words
said flux consists of about 3-10 percent alkali metal oxide wherein at least about 60 percent thereof is K2O; and
Claim 4
Dependent Claim
15 words
A batch according to claim 2 wherein said mineral is montmorillonite from the smectite group.
Claim 5
Dependent Claim
13 words
A batch according to claim 3 wherein bentonite clay provides said montmorillonite mineral.
Claim 6
Dependent Claim
126 words
said B2O3-containing material is included in the necessary amount to produce 7-18 percent B2O3; said batch consisting essentially, calculated by weight on the oxide basis (exclusive of said cellulating agent), of about 3-10 percent alkali metal oxide, 7-18 percent B2O3, 10-20 percent Al2O3, and 50-80 percent SiO2, wherein SiO2: Al2O3 ranges between about 3:1-7:1, the total of alkali metal oxide, B2O3, Al2O3, and SiO2 constituting at least 90 percent by weight of the batch; b. shaping said batch to form an article of a desired configuration; c. firing the shaped body at a temperature between about 875*-1, 000*C. for a sufficient length of time to produce a cellulated body having a density less than about 0.5 grams/cc.; and then d. annealinG the body to room temperature.
Claim 7
Dependent Claim
17 words
A batch according to claim 1 wherein up to 25 percent by weight thereof consists of grog.
Claim 8
Dependent Claim
75 words
An integral glassy body essentially free from devitrification produced by cellulating the batch of claim 1 and exhibiting: a. a density less than about 0.5 grams/cc.; b. a modulus of rupture in excess of about 200 psi; c. an essentially uniform, closed cell structure wherein the cells are generally spherical in shape and do not exceed about 1 mm. in diameter; and d. a coefficient of thermal expansion less than about 50 X 10 7/*c.
Claim 9
Independent Claim
74 words
A method for producing a cellulated glass body essentially free from devitrification and having a density less than about 0.5 grams/cc. which comprises the steps of: a. preparing a batch consisting of particles substantially all passing a standard United States 200 mesh screen and at least 10 percent thereof being finer than 5 microns in diameter consisting essentially, on an anhydrous basis, of rock, a cellulating agent, a flux, and a B2O3-containing material wherein:
Claim 10
Dependent Claim
24 words
A method according to claim 7 wherein said clay contains, as a principal component, at least one mineral from the illite and/or smectite group.
Claim 11
Dependent Claim
15 words
A method according to claim 8 wherein said mineral is montmorillonite from the smectite group.
Claim 12
Dependent Claim
23 words
A method according to claim 7 wherein said time for firing at the cellulating temperature ranges between about 2 minutes to 2 hours.
References Cited (Backward Citations)
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Cited
US2611712A
Cited
US3056184A
Cited
US3174870A
Cited
US3661601A
Cited
US3666506A
Cited
US3723790A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-02-18 | 1977-08-20 | 1978-02-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-02-18 | 1981-08-20 | 1982-02-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-02-18 | 1985-08-20 | 1986-02-19 | $7700.00 | Window Closed / Lapsed |